Molecular interpretation of the XYZ states

Molina, R.; Gamermann, D.; Oset, E.

doi:10.1051/epjconf/20123701014

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A X(3915) X(3872) and χC2(2p )1

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2017

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“…To complete the analysis of this multiplet, we comment on the X(3915) resonance. This state has been described as a cc state [97] and also has been suggested to be a tetraquark [98] and a molecule [99]. In the cc context, this resonance is identified with the 2 3 P 0 state [97].…”

Section: A X(3915) X(3872) and χC2(2p )mentioning

confidence: 94%

Charmonium spectrum with a Dirac potential model in the momentum space

2017

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We study the charmonium spectrum using a complete one gluon exchange approach based on a phenomenological relativistic qq potential model with Dirac spinors in momentum space. We use phenomenological screening factors to include vacuum quantum effects. Our formulation does not rely on nonrelativistic approximations. We fit the lowest-lying charmonia (below the DD threshold) and predict the higher-lying resonances of the spectrum. In general, we reproduce the overall structure of the charmonium spectrum and, in particular, we can reasonably describe the X(3872) resonance mass as (mostly) a cc state. The numerical values of the free parameters of the model are determined taking into account also the experimental uncertainties of the resonance energies. In this way, we are able to obtain the uncertainties of the theoretical resonance masses and the correlation among the free parameters of the model.

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